F.4 3條 PHY 考試用 15分

1. As velocity is a vector, so if upward is mv , downward will be -mv.

for momentum. So, the change of it is mv-(-mv)=2mv

2. As v=ds/dt, and if integrate both sides, Ind (v2 /2)=s/t.

Also, KE of a free falling is 1/2 mv2, combine with Ind (v2 /2)=s/t,

KE has a linear relationship with s (displacement)

3. As total energy = KE + PE,

KE = total energy - PE , whatever the total energy,

KE has a linear relationship with -PE in this case.

Also as the object is moved upward, PE will increases, and

by the above, KE will decrease as PE and KE are inverse of

each other

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